package com.qf.utils;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

public class DBUtils {
    private static DruidDataSource ds;
    private static ThreadLocal<Connection> threadLocal = new ThreadLocal<>();

    static {
        Properties properties = new Properties();
        InputStream inputStream = DBUtils.class.getResourceAsStream("/database.properties");
        try {
            properties.load(inputStream);
            ds = (DruidDataSource) DruidDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Connection getConnection() {
        Connection connection = threadLocal.get();
        try {
            if (connection == null) {
                connection = ds.getConnection();
                threadLocal.set(connection);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return connection;
    }


    public static void begin() {
        Connection connection = getConnection();
        try {
            connection.setAutoCommit(false);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static void commit(){
        Connection connection = getConnection();
        try {
            connection.commit();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static void rollback(){
        Connection connection = getConnection();
        try {
            connection.rollback();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static void close(){
        Connection connection = getConnection();
        try {
            connection.close();
            threadLocal.remove();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}
